Weird facebook coupon issue

So I got a coupon for 25£ this morning in my gmail inbox, for my 1 and a half month old page. Although apparently, you can only use it on accounts under 15 days old (according to google) the hell is the point of that? I only want to use it on my current page. Before I found that out though, I figured it wouldn't charge my card just coupon, so I went ahead and tried to do the advert, lo and behold, it wants payment details before I can redeem anything.
The problem is I put in my card details, it got declined, and to top it off I got a call from the fraud department! Good job Facebook!
Thank god I got declined, I don't want money going out of my bank balance.

I just want to confirm if those 15 day vouchers are isolated, and if FB legit sent me a voucher for my current page and if I can use one of my friends paypals or something and they won't get billed, rather the voucher.
Thanks.

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